Toward the end of the fifteenth century there had come a great
genius laden with important truths in chemistry, but for whom
the world was not ready--Basil Valentine. His discoveries
anticipated much that has brought fame and fortune to chemists
since, yet so fearful of danger was he that his work was
carefully concealed. Not until after his death was his treatise
on alchemy found, and even then it was for a long time not known
where and when he lived. The papal bull, _Spondent pariter_, and
the various prohibitions it bred, forcing other alchemists to
conceal their laboratories, led him to let himself be known
during his life at Erfurt simply as an apothecary, and to wait
until after his death to make a revelation of truth which during
his lifetime might have cost him dear. Among the legacies of
this greatest of the alchemists was the doctrine that the air
which asphyxiates workers in mines is similar to that which is
produced by fermentation of malt, and a recommendation that, in
order to drive away the evil and to prevent serious accidents,
fires be lighted and jets of steam used to ventilate the
mines--stress being especially laid upon the idea that the danger
in the mines is produced by "exhalations of metals.
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